During 2004 The Europen commission decided to create a "Single European Sky" in response to the implementation of the internal market and the increased mobility of Europeans. This led to greater demand for air transport and put a strain on the capacity of the infrastructure and safety requirements have to be improved in parallel with the increase in traffic. Growing environmental awareness is also putting pressure on aviation to demonstrate its environmental performance. Sesar project, the modernisation programme of the European air traffic control infrastructure is the answer that aims at developing the new generation air traffic management system capable of ensuring the safety and fluidity of air transport worldwide over the next 30 years. SESAR will federate public and private funds and guarantee a single management structure for the project, as well as a governance model bringing together all actors involved (public and private). The website of Transport of the European Commission provides more information on air transport in the EU.